In the majority of my gardens, I have no color scheme. I have one bed that is a "dip" bed. And one bed that is a totally red bed (I just love reds) but everything else, has no color scheme -whether it is a daylily or iris bed. The only thing I try to do is put the taller ones in the back. I am in the slow process of building and acquiring plants for a patriotic bed, too.
Eventually I expect that I will start sorting things out more - but it is too hot to even think about it this season. ~Jan